W K Tsang

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Recent studies have demonstrated that the self-stimulation phenomenon may provide a useful technique for investigating the rewarding properties of potentially addictive drugs such as morphine. The present study attempted to examine the nature of morphine's effects on self-stimulation by observing changes in rate-intensity functions following morphine(More)
There has been some controversy whether experimenter-administered electrical stimulation of the brain is aversive or simply less reinforcing than that delivered via self-stimulation. Rats with MFB-LH electrodes self-stimulated with high, medium, and low currents and the self-produced rates were tape recorded. In Experiment 1, the rats were allowed to choose(More)
The effects of morphine and its derivatives on self-stimulation behavior have been widely studied. In those experiments which have used multiple injections (over days) and multiple post-injection tests (within days), the typical findings includes a depression of responding after the initial injections followed by a facilitation of responding on subsequent(More)
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